Reference array



FIG. 1 is a perspective view of a reference array showing our new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof; and,

FIG. 4 is a left side view thereof.

The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design and form no part thereof; all other broken lines depict unclaimed environmental subject matter and form no part of the claim. 

CLAIM The ornamental design for a reference array, as shown and described. 